【題目】I noticed that he was wearing shoes that did not match. He too hard to notice.

A. might be working B. can have worked

C. must have been working D. should have been worked

【答案】C

【解析】考查情態(tài)動詞完成式表示推測。句意：我注意到他穿著不相配的鞋子。他一定是在一直工作很難注意到。must have been doing sth.一定是在做某事，表示對過去事情有把握的肯定推測，故選C。

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